A solid metal rod 1.5m long is free to pivot without friction about a fixed horizontal axis perpendicular to the rod and passing through one of its ends. The rod is held in a horizontal position. Small coins, each of mass "m", are placed on the rod 25cm, 50cm, 75cm, 1m, 1.25m, and 1.5m from the pivot. If the free end is now released, calculate the initial force exerted on each coin by the rod. Assume that the masses of the coins can be ignored in comparison to the mass of the rod.
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